We use the computer in the first place to manipulate data, so obviously you need a way to put the data - in comes the input device. Now the input data has to be processed in the desired format - in comes the Central Processing Unit. Finally you need a means to get back your processed data which is now meaningful information - so we use an output device.
All the devices are related to each other during the entire process of using a computer. Without any one of these we cannot use the computer to its optimum.
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The relationship is called a surjection or a surjective function.
It is a mapping which assigns one or more outputs to each set of one or more inputs. A relationship need not be a function.
~the function is most likely inversely proportional. ~more input results in less output.
Without knowing the specific function or equation being used, it is impossible to determine the output value if the input value is 4. In mathematics, the output value is dependent on the specific function or equation being evaluated. To find the output value when the input value is 4, you would need to know the function or equation being used and then substitute 4 in place of the input variable to calculate the output value.
No. A function has only one output per input.